SKN is a good company. When I talked to them about chip tuning for my 135i they were just too expensive. I ended up going with MS Tuning. Marcel the owner really knows our 1er in and out. He even offers the 130i tuning for a 125i. I posted a dyno of his 125i/128i chip. See my post bellow and scroll thru it. I couldn't be happier with Marcel's work.